Download Biology-1 Exam Two Sample Questions Substrates bind to an

Biology-1
Exam Two
Sample Questions
1. Substrates bind to an enzyme's ________ site.
a. reactant
b. allosteric
c. regulatory
d. phosphate
e. active
2. Which of the following statements regarding enzyme function is false?
a. An enzyme's function depends on its three-dimensional shape.
b. Enzymes are very specific for certain substrates.
c. Enzymes are used up in chemical reactions.
d. Enzymes emerge unchanged from the reactions they catalyze.
e. An enzyme binds to its substrate at the enzyme's active site.
3. Which of the following statements about the ATP molecule is true?
a. It contains five phosphate groups.
b. Extremely stable bonds link the second and third phosphate groups.
c. It contains the sugar glucose.
d. It releases energy when one phosphate group leaves ATP.
e. None of the above
4. How do cells recycle NADH back to NAD+ during alcohol fermentation in yeast cells?
a. by converting pyruvate to lactic acid
b. by convertying pyruvate to ethanol and carbon dioxide
c. by converting pyruvate to acetyl CoA
d. by converting glucose to pyruvate
e. none of the above
5. Which of the following is not a product of glycolysis?
a. CO2
b. pyruvate
c. NADH
d.ATP
e. a and b
6. True/False. Redox reactions power the synthesis of ATP in photosynthesis and in cellular respiration.
7. FAD acts as a(n) __________in cellular respiration.
a. reducing agent
b. oxidizing agent
c. electron donor
d. base
e. enzyme
8. Why are most plants green?
a. Chlorophyll a reflects green light.
b. Chlorophyll a absorbs green light.
c. Chlorophyll b primarily uses green light as the source of energy for photosynthesis.
d. Green helps plants blend into their environment as a sort of camouflage.
e. All photosynthetic pigments are colored green.
9. Clusters of light-gathering pigments in a photosystem
a. pass energy to the reaction center.
b. are found in the roots of plants.
c. absorb electrons.
d. do not absorb photons.
e. break down H2O
Biology-1
Exam Two
10. The mitochondrion ATP synthase
a. is a nucleic acid complex.
b. transports H+ ions from the matrix to the intermembrane space.
c. couples the flow of H+ to the phosphorylation of NAD+.
d. is embedded in the outer membrane of the mitochondron.
e. helps transport H+ against the concentration gradient.
11. As a result of the cascade of electrons down the electron transport chains of the light reactions,
a. NADPH is reduced to NADP+.
b. NADPH is oxidized to NADP+.
c. NADP+ is reduced to NADPH.
d. NADP+ is oxidized to NADPH.
e. water is formed.
12. Sunlight is a type of ________ energy.
a. electromagnetic
b. potential
c. stored
d. kinetic
e. nuclear
13. The summary equation for photosynthesis is
a. 6 CO2 + 6 H2O + sunlight → C6H12O6 + 6 O2.
b. C5H12O6 + 6 O2 + sunlight → 5 CO2 + 6 H2O.
c. C6H12O6 + 6 O2 + sunlight → 6 CO2 + 6 H2O.
d. the same as the equation for glycolysis written in reverse.
e. 6 CH2O + 5 O2 + sunlight → CO2 + 2 H2O.
14. Carbon dioxide crosses a plasma membrane by
a. osmosis
b. active transport
c. passive transport
d. pinocytosis
e. exocytosis
15. In a hypotonic solution, an animal cell will
a. lyse
b. experience turgor
c. neither gain nor lose water
d. shrivel
e. lose water
16. Small, nonpolar, hydrophobic molecules such as fatty acids
a. easily pass through a membrane's lipid bilayer.
b. very slowly diffuse through a membrane's lipid bilayer.
c. require transport proteins to pass through a membrane's lipid bilayer.
d. are actively transported across cell membranes.
e. usually enter the cell via endocytosis.
Sample Questions